Title: Characterizing Quantum Many-body Dynamics with Projected Ensembles

Speaker: Prof. Ge Ziyong

Time: April 23, 15:30

Venue: Room 213, 2nd Floor, Physics Building (Building 18)

[Abstract]

Traditional studies of quantum many-body physics often rely on observables and entanglement derived from density matrices. Recently, projected ensembles have been introduced as a powerful framework, capturing deeper aspects of quantum thermalization and entanglement. In this talk, I will first present our experimental investigation of chaotic many-body dynamics on a superconducting processor using projected ensembles. We observe Haar-distributed steady states, providing direct evidence of deep thermalization. By defining an ensemble-averaged entropy, we also establish a benchmark for many-body information leakage. Then, I will introduce bipartite projected ensembles to characterize entanglement phases. The ensemble-averaged entanglement can serve as a correlation function, revealing phase transitions and their critical properties, including scaling behavior and surface exponents in monitored random circuits.

Announced by the School of Physics and Optoelectronics